Plenty of bad decisions from Mozilla were the results of conflicts of interest - between their desire to be useful to users in the immediate term and their desire to push for a better web in the long term, or between individual employees' views and the organisation's interests, or even between their users' interests and the organisation's desire for money (the default search provider) - being a nonprofit doesn't mean you don't want money, it just means you spend everything you get, managers who want to empire-build still want to increase their revenue even in a non-profit.

Mozilla is exempt from one very specific set of interests that other web organisations have. They still have a vast number of competing interests to consider in their decisionmaking. Indeed Google's controlling shareholders, being mostly billionaires, may well exert less pressure in practice than Mozilla's donors.